This video is about Fixed Error android error attempt to invoke virtual method and resolved java.lang.NullPointerException: Attempt to invoke virtual method.

Many error code cames in list of android error codes while forced close android error in application and developer can trace it from android error log with android error message. General error for beginners is android error attempt to invoke virtual method or simple message attempt to invoke virtual method on ComponentInfo tag message. Deal with textview gets error attempt to invoke virtual method 'void android.widget.textview.settext or attempt to invoke virtual method on a null object reference just due to missing findviewbyid manytimes.
so, most probability is discussed in this video.
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